package test;

public class Pow {
	//快速幂
	public double pow(double x,int n){
        if(n==0) return 1;
        double tmp=pow(x,n/2);
        return n%2==0?tmp*tmp:x*tmp*tmp;
    }
    public double myPow(double x, int n) {
        return n<0? 1.0/pow(x,-n):pow(x, n);
    }
}
